While there isn't debug mode in vanilla Valheim using admin mode on a server, you can run some basic commands by giving yourself admin powers.
1. Open the File Manager

2. Navigate to .config/unity3d/IronGate/Valheim/adminlist.txt
1. Right click adminlist.txt and click Edit
2. Paste the Steam IDs of the players you would like to make admin, one per line, prefixed with V_
NOTE: This document is Case Sensitive so make sure that the V is capitalised

3. Save and close the file
4. Restart the server and the player(s) will have admin privileges

| Command | Function |
Help |
Shows the available admin commands. |
Ban [name/ip/userID] |
Permanently bans a player using their name, ID, or IP. |
Unban [name/ip/userID] |
Removes a player from the ban list. |
Kick [name/ip/userID] |
Kicks a player from the server (Note: this does not ban them) |
Banned |
Displays all currently banned players. |
Save |
Saves the current world. |
Info |
Displays current system information. |
Ping |
Checks the server's network latency. |
Lodbias [Value] |
Changes the level of detail for distant objects (0–5). |
Debugmode |
Enables debug features such as flying, free building, and killing nearby creatures. |
ListKeys |
Lists all active global keys. |
SetKey [name] |
Adds a global key. |
ResetKeys |
Resets all global keys. |
RemoveKy [name] |
Removes a specified global key. |
S [message] |
Sends a message to the game chat. |
Say [message] |
Sends a message to the chat. |
W [player] [message] |
Sends a private message to a player. |
God |
Enables invincibility. |
ExploreMap |
Reveals the entire map. |
NoMap |
Hides the map from players. |
NoPortals |
Disables portals on the server. |
ResetMap |
Resets/hides the explored map. |
GenLoc |
Redistributes unplaced objects around the map. |
PrintLocations |
Lists loaded locations, including distances and offsets. |
Pos |
Shows your current world coordinates. |
Goto [x] [y] [z] |
Teleports you to the specified coordinates. |
Location |
Sets a new spawn location. |
Find [text] [pingmax] |
Searches for objects and marks them on the map. |
Players [number] |
Sets the player difficulty level. |
Spawn [Item/Enemy] [Quantity] [Level] |
Spawns an item or enemy with the specified parameters. |
Itemset [name] [keep] |
Spawns an item set; keep can prevent items from being dropped. |
Respawn |
Kills your character and makes them respawn. |
ResetSpawn |
Resets the current spawn location. |
raiseskill [Skill] [Level] |
Increases a specified skill by the given amount. |
resetskill [Skill] |
Resets a specified skill to zero. |
SetPower [name] |
Gives a player a specified Forsaken Power and resets its cooldown. |
Heal |
Fully heals your character. |
KillAll |
Kills nearby enemies. |
Tame |
Tames nearby creatures that are capable of being tamed. |
RemoveBirds |
Removes nearby active birds. |
RemoveFish |
Removes nearby active fish. |
RemoveDrops |
Removes nearby dropped loot. |
PrintCreatures |
Lists active creatures along with their numbers and levels. |
NoCost |
Removes material and construction costs. |
Puke |
Resets hunger, health, and stamina/endurance values. |
Ghost |
Makes enemies ignore your character. |
ForceDelete [radius=0] |
Deletes objects within the specified radius, with certain exclusions. |
Skiptime [number of seconds] |
Advances the game time by the specified number of seconds. |
Time |
Shows the current time and sleep status. |
Timescale [target=1] [fadetime=0] |
Changes the speed of the game world. |
Death [0-1] |
Sets the time of day using the specified value. |
Event [name] |
Starts a named event. |
RandomEvent |
Starts a random event. |
StopEvent |
Stops the currently active event. |
Wind [angle] [intensity] |
Changes the wind direction and strength. |
ResetWind |
Restores the default wind settings. |
ClearStatus |
Removes your character's status effects. |
AddStatus [name] |
Applies a specified status effect. |
FreeFly |
Enables a free-moving camera/photo mode. |
Model [0 or 1] |
Changes the character's body type. |
DpsDebug |
Enables the DPS debugging display. |
Test OldComfort |
Tests/resets the older comfort calculation. |
OptTerrain |
Updates older terrain to the newer terrain system. |
TutorialReset |
Resets tutorial messages. |
TutorialToggle |
Toggles tutorial messages on or off. |
Fov [number] |
Changes the field of view. |